Ten-key calculating machine



Feb. 21, 1950 G. v. LILJESTRM TEN-KEY CALCULATING MACHINE Filed sept. 9, 1943 1.0 Sheets-Sheet 1 Feb. 21, 1950 G. v. LILJESTRM TEN-KEY CALCULATING MACHINE 10 Sheets-Sheet 2 Filed sept. 9, 1943 Feb. 21, 1950 G. v. LILJESTRM TEN-KEY CALCULATING MACHINE Filed sept. 9, 1943 lO Sheets-Sheet 3 Feb. 2l, 1950 G. v. LILJESTRM TEN-KEY CALCULATING MACHINE lO Sheets-Sheet 4 Filed sept. 9, 194:5

Feb. 2l, 1950 G. v. L lLJEsTRM TEN-KEY CALCULATING MACHINE lO Sheets-Sheet 5 Filed sept. 9, 1943 Feb 21, 1950 G. v. LILJESTRM 2,498,439

TEN-KEY CALCULTING MACHINE Filed Sept. 9, 1945 10 SheecSShee 6 Feb. 21, 1950 G. v. LILJESTRM TEN-KEY CALCULATING MACHINE lO Sheets-Sheet 7 Filed Sept. 9, 1943 sa 49 47 4a 4/ :Er-4:2 D.

/7 z2 my 4503 Feb. 2l, 1950 G. v. LILQESTRM v 2,498,439

TEN-KEY CALCULATING MACHINE Filed sept. 9, 1943 1C sheets-Sheet 8 EF- -Z- 772 T E. Z E.

Feb. 21, 1950 G. v. LILJESTRM TEN-KEY CALCULATING MACHINE 10 Sheets-Sheet 9 Filed Sept. 9, 1943 Febo 2l, 1950 G, V, I ILJESTRM 2,498,439

TEN-KEY CALCULATING MACHINE Filed Sept. 9, 1943 lO Sheets-Sheet lO L Y l m: i Q `0 f l: s MUNI I j 5:1 j I :I 53? :Jj f"| l I ,V

i.. I' I! I' L Jmwf/ mgfipn mm@ 1f/ouf, mV/72% Patented Feb. 2l, 1950 UNITED ySTATES PATENT OFFICE TEN-KEY CALCULATING MACHINE Gustaf Vilhelm Liljestrm, Goteborg, Sweden Application September B, 1943, Serial N o. 501,605 In Sweden September 12, 1942 2 Claims. 1

The present invention relates to calculating machines for performing calculations according to the four rules.

Moreparticularly, the invention'relates to tenkey-set calculating machines having an indexing mechanism movable step-by-step across the machine and rotatable and slidable calculating spindles for transferring the items set up in the indexing mechanism to a totalizer mounted on Va calculating carriage.

According to one feature of the invention the calculating spindles are moved longitudinally by the action oi spring loaded members which also effect the setting o1" the numeral wheels of the indexing mechanism, and are rotated by means of a set of proportionracks arranged in superposed relation to each other.

The indexing mechanism also actsl as a selector which on the setting of the indexing elements `predetermines the setting of the calculating elements of the machine with relation to their driv- Fig. 1 is a section of the machine along fa vertical plane parallel to the side walls of the machine frame, that is, a vertical longitudinal section.

Fig. 1a is a View similar to Fig. 1 of part of the mechanism with some of the parts in diierent positions of operation.

Fig. 2 is a plan view of the machine with parts shown in section and other parts broken away.

Fig. 3 is a vertical longitudinal section of the rear part of the machine to show certain details of the driving mechanism of the machine.

Fig. 4 is a side elevation, partly in section, of

the starting and operation controlling mechanism of the machine.

Figs. 5-7 are diagrammatic front views of the racks for rotating the calculating spindles, Fig. 5 showing their normal position, Fig. 6 their extreme right hand position, and Fig. 7 their extreme left hand position.

Fig. 8 is a front View of the calculating spindles and associated elements.

Fig. 9 is a front view,partly in section, and Fig. 10 is a plan view of the stepping device for the indexing mechanism.

Figs. 11 and 12 are side elevations 4of an interrupter for the electric driving motor -of the machine, Fig. 11 showing the open kstate and Fig.

12 the closed state thereof.

Figs. 13 and 14 are side elevations of certain details of the operation rcontrolling mechanism as seen in two different positions.

Fig. 15 is a side elevation of other details of said mechanism. y

Fig. 16 is a plan View of the driving device of the quotient register of the machine.

Fig. 17 is an end view of said driving device; Yas seen from the right hand side of Fig. 15.

Fig. 18 is a side elevation of certain details' of a device for automatically restoring the indexin mechanismtoits normal position.

Fig. 19 is a plan view of other details of said restoring device.

Fig. 20 shows means for actuating the interrupter of th driving motor under the control of the restoring device.

Fig. 21 shows means for restoring to normal the individual elements of the indexing mechanism on the resetting thereof to starting position.

Fig. 22 shows a cam slot disc for operating the yracks controlling the rotation of the calculating spindles, and Fig. 23 shows the c-am .slot developed.

For the sake of better understanding 1 will hereinafter describe the various main parts of the machine individually and explaintheir `operation in connection therewith. The main parts of the machine are a key board, an indexing mechanism or selector controlled by the keys o'f said key-board, a group of counting spindles the setting of which preparatory to the performance of a counting operation is determined by the indexing mechanism, a set of toothed racks, hereinafter referred to as'proportion racks, for operating the counting spindles in conformity with the setting thereof, a manually operated or powerdrivenmain shaft for actuating the proportion racks, and a carriage movable crosswise of the machine for supporting the totalizer `and the quotient register. Of these main parts, the said carriage, the totalizer and the quotient register are only indicated, i. e. not illustrated in detail, since they do not constitute subject matterof the invention but may beof conventional type.

The main parts above stated are all mounted in a rigid frame, comprising a base plate l two side members, hereinafter referred toas left hand and right hand side members and designated by the numerals 2 and 3,"respectively, and a plurality of plates or stays arranged across the frame to interconnect the side members thereof. At/the front of the frame the key board of the machine is constituted by an upper plate 4, a lower plate'v 5 situated slightly above the base plate l of the frame and a rear plate 6 extending from the rear edge of the lower plate 5 up tovabout half the height of the key board and slightly inclined rearwardly. Inserted between the upper and f lower plates 4, '5 of the `key board is a set of vert-ical plates 11 .extending parallel .to the .side members kof :the .frame which form partitions of the key board frame and supports for the movable elements of the key board. The transverse stays comprise, substantially,v rear upper and front lower bars 8 and 9, respectively, for supporting the totalizer carriage, and a bar I9 for supporting the indexing mechanism.

The key board, Fig. 2, includes ten numeral keys II, marked with the digits to 9, for instance in the way indicated in the drawing, two keys I2 and I3 by means of which the machine can be set for addition and multiplication or subtraction and division, respectively, two tabulator keys |4, |5 for effecting the stepping of the totalizer carriage to the right and left, v"respectively, and, finally,

`a shift arm I6 settable in the performance of a multiplication or a division, to permit repeated operations by preventing the restoring of the indexing mechanism and the counting spindles to their starting positions.

The numeral keys II, Fig. 1, are supported by vertical rods |1 slidably mounted in the upper and lower plates 4 and 5 of the key board frame Springs I9 normally keep the keys in their` raised position, as shown in Fig. 1. Associated with each numeral key is a bell crank lever |9 mounted on a pin 20 fastened to an appropriate one of the partitions 1. Each bell crank lever I9 comprises an approximately horizontal arm engaging a slot in the supporting rod I1 of the respective key and an approximately vertical arm, engaging a longitudinal extending bar 2|. The bars 2| are arranged so as to slope slightly downward rearwardly and are guided in apertures formed in the rear wall 6 of the key board frame. Said apertures are situated above each other, the bars being correspondingly bent to allow said arrangement; thus the rear ends of bars 2| projecting beyond the wall 6 form a vertical row, as shown at 22 in Figs. 1 and 9.

l Normally, the ends 22 of the bars 2| only project slightly beyond the wall 6. On depression of Y a key the corresponding bell crank lever I9 is swung in clockwise direction, as viewed from the right hand side of the machine, thereby displacing the associated bar 2| rearward, causing its rear end 22 to project further beyond the wall 6. In this position the 4projecting end of the bar acts as a stop for a setting element of the indexing mechanism.

The said displacement of the bar 2| may also be utilized in releasing the setting element and controlling the feeding of the indexing mechanism one step to the left. These functions will be more fully explained in connection with the description of the indexing mechanism.

The indexing mechanism is mounted in a frame 23 slldable on the smooth bar represented by the cross stay I9 by means of upper and lower slide shoes 24, 25, respectively, see Figs. 1 and 2. A strong coil spring 26, Fig. 19, tends to displace the indexing mechanism to the left. The indexing mechanism includes a plurality, in the example shown nine, numeral wheels 21, Figs. l, 2 and 19, visible through a window in the cover of the frame (not shown). Said numeral wheels are rotatably mounted on a shaft 28 extending across the frame 23. Rigidly attached to each numeral Wheel is a toothed wheel 29 in mesh with a vertically movable rack 39 individual thereto. Traction springs 3| secured at their upper ends to the respective racks and at their lower ends to the frame 23 tend to displace the racks downwardly and rotate the respective numeral wheel correspondingly. Formed'in the rack below the teeth thereof is a set of rectangular teeth and notches 32 for locking the rack subsequent to its displacement. For each rack 30 a pawl 33 is provided mounted on a shaft 34 which engages the rack 39 to maintain it in its uppermost, or normal, position. Said pawls are held in said engagement by means of springs 35. The release of a pawl is effected by means of a releasing mechanism controlled by the bars 2| which acts upon depending arms 36 of the pawls to release same when the setting of the respective numeral wheel is to take place.

The means for releasing the pawls 33 is combined with a feeding mechanism for stepping the indexing mechanism. This combination is shown in detail in Figs. 9 and 10.

Rigidly mounted at the front surface of the rear wall 6 of the key board is a vertical shaft 31. Pivoted to this shaft is an I-shaped body comprising an upper horizontal member 38, a lower horizontal member 39 and a vertical bridgemember 49 interconnecting the members 38 and 39. The upper member 38 is extended on the opposite side (to the left) of shaft 31 and forms there a finger 4| abutting against the wall 6 under the action of a spring 42. Each individual bar 2| is formed with a shoulder 43 bearing against the bridge member 49, as shown in Fig. 10.

Pivoted to the lower portion of the bridge member 49 `at 45 is a lever 44. Said lever includes a horizontal member extending from the pivot pin 45 below the row of ends 22 of bars 2| and a vertical member extending along the right hand side of said row of bar ends 22. A spring 46, Fig. 9, acts on the lever 44 to hold it in a position in which the vertical member thereof abuts against the right hand end of the upper member 38 of the I-shaped body 39--49. In this position a projection 41 on the upper end of the vertical member of lever 44 projects above the level of said member 38 into the path of teeth formed onthe lower edge of a bar 48 rigidly attached to the frame of the indexing mechanism. The upper member 38 of the body 39--49 is provided with a similar projection 49 on its upper surface, said last mentioned projection being positioned to the left of the projection 41 a distance corresponding to half a pitch of the rack 48 and being further displaced forwardly with relation to the projection 41 as will clearly appear from Fig. 10.

The mechanisms above described operate as follows:

On depression of a key the corresponding bar 2|, as already stated, is displaced rearwardly, causing its rear end 22 to project to such an extent beyond the wall 6 (as indicated at 22' in Fig. l) as to allow it to act as a stop for a downwardly moving rack 39 of the indexing mechanism. The bar 2| thus displaced actuates by means of its abutment 43 the bridge member 49 of the body 38-49, causing the latter to turn on its shaft 31, until the projection 41 reaches aposition behind the rack 48 out of the path of its teeth. At the same time, however, the projection 49 enters the path of said teeth. As a result, the indexing mechanism 'or selector is allowed to move to the left under the influence of the spring 29 until the tooth of the rack 48 previously in engagement with the projection 41 is f stopped by the projection 49, that is to say, after the rack has moved about half a pitch or step to the left. During the turning of the body 38-40 .just described, the projection 41 actuates the amuse.

spring 'al until Stopped by the projecting end 22 of abar 2|. By said movement of a rack 30, the associated numeral wheel 21 is rotated a number of steps corresponding to the movement of the rack, into a position, in which it shows the digit set up.V As the key is released-it is restored to its normal position by its spring `I8, the corresponding bell crank lever I9 and associated bar 2| being at the same time returned to their normal Ypositions. As the bar 2| is restored, thebody 38-40 is swung back by the action of the spring 42 until itsnnger A4| is stopped by the wall 6. During this operation the projection 49 is movedout 'of the path-of the teeth of rack 48 while the projection 41f-is moved thereinto. The indexing mechanism is thus displaced to the left the remaining portion of the pitch, that is, the succeeding tooth of rack 48 fis caught by the projection 41. At the Commencement of this displacement the slot'32 which is at l'that time'on a level with a bar 50 rigidly attached lto the wall 6, Fig. 10, will allow the rack 301to slide in yon said bar. By this means therack 36 is locked in its set position as long as it isA situated to the left of the row of projecting bar ends 22.

'To enable Ya manual restoring of the indexing mechanism, as is common in performing multiplicationsor divisions, a handle 5|, Fig. 2, is provided at the right hand side of the frame of the indexing mechanism.

The racks 39 of the indexing mechanism are each formedwith a shoulder 52 on their rear edge, said 'shoulder representing a stop to'determine the setting of those counting elements by means of whichthe items set up are transmitted to the totalizer. Said counting relements comprise rotatableand slidable counting spindles arranged in a vertical or inclined position behind the extreme left hand position of the indexing mechanism. The counting spindles extend parallel with the racks 39 of the indexing mechanism and correspond to the same in number and mutual distance. Each counting spindle includes a lower rod-shaped member 6|, Fig. l, slidably and rotatably mounted in a `rigid frame, and an upper sleeve-shaped Amember 62 slidably but not rotatablyL connected to the lower member. The sleeveshaped members of the various spindles are 'rotatably mounted by means of upstanding studs 64 in a 4common beam 63 extending transversely above the sleeves. Eachstud carries a mitre wheel 65 meshingwith a mitre wheel 66 journalled on a transversely extending shaft 61 rigidly secured to the beam 63. Rigidly attached to each mitre wheel 66 is a spur wheel .68 adapted to mesh with la spur wheel 69 connected to the numeral Wheels of the totalizer which are visible through a window 10 `,provided in the totalizer carriage 1| reciprocable along the bars Band '9.

The lower members 6| of the counting spindles vare rotatably and slidably mounted in cylindrical borings of a lower arm ,'12 and an'upper arm 12 of Vframe 69. At their upper ends the spindles 6| are flattened on diametrically opposite sides and vbrought Iinto engagement with correspondingly elongated apertures in the bottom 62 of the "sleeves 62. The lower member 6| of each counting spindle .is carried by a parallel guide rod 13 slidably mounted in the frame 60. Each guide rod carries its corresponding spindle member 6| by means of a fork-shaped lower arm 14, embracing a toothed wheel 15 rigidly mounted on the spindle member` 6|. The end of the arm 14 remote from the vtoothed wheel 15 which lis desigvnated bythe referencenumeral 16 .is adapted-to 76 check the setting movement of the associated spindle by engaging the shoulder 52 of a rack 30 situated right'in front-of the spindle, as the guide rodv and the spindleafterthe guide rod has been released by -withdrawing a stop member therefor descend under the action of a springA 11. attached to -the end 16 of arm 14. Thus, the counting spindle -is moved to a .positiondetermined by the downwardmovement of the vrack 36 which movement in its turn is determined by the depression of afnumeral key. Itis thus seen that the counting spindle has-been set to a position determined by th'ekey depressed.

The above said stop member comprises a bridge T8 adapted to cooperate with all of the guide rods,"Figs. land 8, which is mounted to turn about a transversely extending shaft 19 carried by posts secured tothe vbase plateiof the .machine frame, Normally said bridge holds the guide rods in raised positiongas indicatedby dotted lines in Fig. l.` The bridge is actuated from the main shaft 80 `by the following means.

The bridge 18 is provided with a rearwardly projecting arm 8| having a laterally. projecting pin 82 near its end. Said pin engages an .elongatedslot 83 of a plate 84, radially arranged with respectto the shaft 80, which carries a pair o! rolls '85, 86 for cooperation Witha cam 81 on the main shaft, whereby a reciprocating movement is imparted to the plate 84 on the rotation of the mainshaft. .In this reciprocating movement the plate 84 `isguided by the main shaft by means of a' slot88f through which the main shaft extends. Mounted on the plate 84 is a pawl 89 normally maintaining the pin v82 in engagement with the lower end of the slot 83, thereby causing the bridge i8 to oscillate upon the rotation of the mainshaft.

The vertically movable beam 63 in which the sleeves 62 of the counting spindles are mounted, is-carried by two slides (Figs. 3 and 8) movable up and down in the frame 60. By means of pins 9 I Fig. 3, the slides 90 are .suspended in the forked endsof arms 92 secured to the ends of a transverselyextending shaft 93 rotatably mounted in the frame .60. Eachof said arms is formed integrally with an upwardly projecting arm 94. vThe two'arms 94 are connected together by means of .a cross stay 95 adapted upon the rotation of shaft 93 to actuate vpawls 96 cooperating with the numeral wheels 69 of the totalizer for braking purposes. The arm 92 attached to the right hand end of shaft 93is also formed integrally with a depending arm 91 carrying a roller 98 in engagement with a cam 99 on the main shaft 80 in order toA impart an oscillation to the shaft 93 upon .rotation of the mainsha'ft.

The toothed wheels 15 on the counting spindles areA adapted to impart to the spindle a rotary movement the amount of which is determined by the vertical adjustment of the spindles. Said transfer of movement is effected from a series of transversely extending racks |06 placed above eachother behind the group of counting spindles.

The transversely reciprocable racks |80 are nine .in number in the example shown. The lowermost'onerests on a rack |U| rigidly arranged ;in the 'machine frame, cfr. Figs. 5-"1, Each reciprocable rack carries on its rear edge a pin |02 situated in the middle of the rack. All of the ,pins |02=-fengage a-guiding groove |03 formed in 'a bar |04 pivoted to the fram 60 by a stud |05 the vcentre of `'which is on a level slightly above that of the uppermost rack |08. Attached to the vother end .of the pivot stud |05 is an upwardly vthe left.

projecting ariii |06 carrying a pin lI'I'II iii engagement with a cam slot |08 formed in the cylindrical circumference of a drum |09 on the main shaft 80. Thus, by the rotation of the main shaft the arm |06 and the bar |04 are caused tol oscillate about the axis of the stud |05, thereby imparting a reciprocation to the racks |00, the amount of which is different for each individual rack. The rack |I, of course, has no connection with the bar |04.

Fig. shows the position of the racks, which may be termed proportion racks, with respect to each other in the full cycle position of the machine. In this position the guide bar |04 is vertical. The teeth of every second rack are now situated right above, or below, the spaces of the adjacent lower and upper racks. rIhe toothed wheels "I5 of the counting spindles are in mesh with the uppermost rack |00 inasmuch as they are held in raised position by the bridge 18 and cannot move down. On rotation of the main shaft one revolution the guide bar |04 is caused to swing, according to the direction of rotation, first to the one and then to the other extreme positon, shown in Figs. Gand 7, to be then restored Ato the normal position shown in Fig. 5. In said extreme positions the tooth spaces of the racks |00 are all situated above the tooth spaces of the stationary rack |0I. The bridge 'I8 while descending allows the toothed wheels 'I5 and the counting spindles to descend until the 'projections 'I6 are caught by the shoulders 52 of the oppostely positioned racks 30 of the indexing mechanism or selector. The cam slot |08 controlling the movement of the guide bar |04 includes for each of the extreme positions a straight portion B or D of comparatively large angular extension, as indicated in Fig. 23. The guide bar |04 is thus held stationary in its extreme positions -for a sufficiently long time to allow the spindles to descend or be raised, as the case may be.

On the displacement of the racks from their normal position shown in Fig. 5 to one extreme position, as for instance to that shown in Fig. 6, vthe uppermost one of the racks |00 is displaced half a pitch to the right, the rack next following va whole pitch and so on, and the lowermost rack @i1/2 pitches. In the position shown in Fig. 6 the lower members 6| of the counting spindles are forced downwards by their spring II to the positions determined by the shoulders 52 of the selec- .tor racks 30 set. During the subsequent swingring movement of the guide bar |04 from the position. shown in Fig. 6 to the position shown in f Fig. 7 under the control of the portion C of the cam slot |08 (Fig. 23), the uppermost rack |00 will be displaced to the left a distance corresponding to an` entire pitch, the next, or second, rack a distance corresponding to 2 pitches, the i third rack a distance corresponding to 3 pitches and so on, so that the lowermost rack |00 will be displaced a distance corresponding to 9 pitches to The toothed wheels 'I5 in mesh with the various racks |00 impart when thus displaced a corresponding rotation of the respective counting spindles. In the other extreme position the lower members 6| of the counting spindles are raised by the bridge 'I8 so as to again engage the uppermost rack |00.

The main shaft 80 from which the movements of the proportion racks |00 and the bridge 18 are derived is mounted, in part, in the right hand side member 3 of the machine frame and, in

part. in a separatebearing post comprising an iframe near the bottom 5 thereof.

upright ||0 and two side members and H2, Fig. 2. The side member is also secured to the left hand member 2 of the frame. Provided in the side member |I2 is a bearing for the left hand end of the main shaft. Mounted in the side member II and the left hand side member 2 of the machine frame is a horizontal shaft ||3 situated on a line with the main shaft. A thin end piece |I4 of the main shaft extends to the shaft I I3 and preferably into a through extending boring thereof.

To permit manual driving, the main shaft carries outside the right hand side member 3 of the machine frame a handle not shown in the drawing. The motor drive for the main shaft is constructed as follows.

Provided in the rear portion of the machine frame is an electric driving motor |I5 indicated by dotted lines in Fig. 2 which is screwed to the base plate I of the frame. The motor shaft IIS carries a pinion |I'I in constant mesh with a toothed Wheel IIB rotatably mounted on a shaft Il!)v attached to the left hand side member 2 of the frame. Rotatably mounted on said shaft I I9 is another toothed wheel |20 which may be vcoupled to and uncoupled from the toothed wheel IIB by means of a clutch illustrated inFig. 3. The toothed whe-el |20 is in constant mesh with a toothed wheel 2| on shaft I3.

On its end facing the main shaft, at the inside of the side member of the bearing post |I0 II2, the shaft 3 carries a bevel Wheel |22. Loosely mounted on the opposite end of the main shaft, at the inside of the side member |2 of said bearing post, is a similar bevel wheel |23. The two bevel wheels |22 and |23 are both in mesh with an intermediate bevel wheel |24 mounted in the upright ||0. Slidably but not rotatably mounted on the extension H4 of the main shaft located between the bevel wheels |22 and |23 isa clutch sleeve |25 having claws at both ends adapted to engage recesses |26, |2'I formed in thehubs of the bevel Wheels |22 and |23. By means of this clutch the main shaft may be coupled either directly to the shaft I|3 or to the bevel wheel |23 so as to effect either a non-reversed or a reversed transfer of movement between the shafts I I3 and 80.

The operation of the clutch sleeve |25 is controlled by means of the keys I2 and I3. Said keys `are carried by vertical rods |29 and |30, respectively, which are slidably mounted in the upper and lower walls 4 and 5, respectively, of the key `board frame, see Fig. 4. Rod |29 rests by means of an abutment I3I on the upper edge of a lever |33 which is mounted to rotate on a transversely extending stud |35. Rod |30 rests similarly by means of an abutment |32 on the upper edge of a lever |34 mounted on a transversely extending stud |36.. Said levers |33, |34 are acted on by springs |37 and |38, respectively, which normally maintain the levers and thus also the keys I2,

'I3 in raised position. The free ends of the levers |33, |34 are oppositely directed and overlap each otheras shown. The lower edges of the levers |33, |34 are shaped as curves |39 and |40, respectively, adapted to engage a pin |4| on an 'arm |42 which is keyed to the right hand end of a shaft |43 extending across the key board Said curves |39 and |40 are so designed as to cause the lever V|33 when moving down as a result of the depression of key I2 to move the pin |4| from the position shown in full lines in Fig. 4 to the posiftion indicated by the dotted circle I4I, whereas the lever |34 in its downward movement as a result of a depression of key I3 returns the pin |4| from the position |4| to the position shown in full lines. By this means the shaft |43 is rotated in counter-clockwise direction as seen from the right hand side of the machine on the depression of key |2 and an equal angle in clockwise direction on the depression of key I3.

To the left hand end of shaft |43 is attached an arm |44, Figs. 1 and 2. A link |45 connects this arm with one end of a bell crank lever |46 mounted on the base plate by means of a pivot |41 situated nearly vertically below the main shaft 80. The other end of said bell crank lever is shaped as a fork |48, Fig. 2, embracing the lower end of a vertical control bar |49 for the clutch sleeve 25. Said control bar is mounted in the bearing post at |50, Fig. l. By the mechanism above described the clutch sleeve |25 is brought to engage the bevel wheel |23 on the mainshaft 80 on the depression of key l2 and is caused to engage the bevel wheel |22 on shaft ||3 on the depression of key I3. In the former case the main shaft is coupled for rotation in the direction required for multiplication and addition and in the latter case for rotation in the direction required for division and subtraction.

The keys I2 and |3 not only effect reversal of the main shaft but also function as starting keys for the motor drive. To this end each of the abutments |3| and |32 of the key rods |29 and |30 actuate not only the levers |33 and I 34 but also bell crank levers and |52, respectively. The former is mounted on the same stud |35 as the lever |33, the latter, on the contrary, being mounted on a separate stud |53. Bell crank lever |5| comprises an approximately horizontal'arm projecting into the path of therespective abutment |3|, the upper edge of which is situated at a'eertain distance below the upper edge of the corresponding lever |33, and an approximately vertically depending arm journalled at |54 to link |56. Bell crank lever |52 similarly comprises a horizontal arm projecting into the path of abutment |32, the upper edge of which is situated at a certain distance below the upper edge of lever |34, and a vertically depending arm journalled at |55 to link |56. Said link which is common to both of the bell crank levers is acted on exactly in the same way by both of them, inasmuch as on depression of either key I2 or i3 it will be displaced forwardly, that is to say towards the key' board a little distance after the rotation of shaft |43 and thus the cou- .pling of the main shaft for the desired direction ofrotation has been completed. Said displacement of link |56 is utilized on the one hand for coupling together the toothed wheels ||8 and |20 rotatably mounted on the shaft ||9 in order to enable power transmission from the motor shaft to shaft ||3 and on the other hand for closing the circuit of the driving motor. To this end the following means are provided.

The above said clutch inserted between the toothed wheels I I8y and |20y rotatably mounted on shaft |I9 comprises a toothed disk |60 rigidly connectedy to one toothedwheel, as for instance, wheel ||8, Fig. 3, and a pawl |63 mounted to turn on a pivot pin |62 which Amay be either directly attached to the other toothed wheel |20 or to a disk |6| rigidly connected thereto. Pawl |63 is acted on by a spring |64 tending to bring the pawl into operation. rThe release ofthe pawl is effected by means` of a releasing arm |65 en- ;gaging a projection |66 ofthe pawl. The releas- ISU ,fork and raising the releasing arm |65.

ing arm is mounted on a stud |61 and carries on the opposite side thereof, that is to say in front of said stud, a fork-shaped projection |68 the slot |69 of which is engaged by a pin |18 attached to the end of an arm |1|, Fig. 1, xed to a shaft |12 extending across the frame Si] and rotatably mounted therein. The stud |61 carrying the releasing arm |65 is carried by a lever |13, Fig. 3. pivoted at |14 to the left hand member of the machine frame. The lever |13 carries below the pivot |14 a forwardly projecting arm urged upwardly against a pin |15 under the influence of a strong spring |16. rI'he other, that is to say upper, end of said spring forces a forwardly projecting arm of another lever |11 mounted on the stud |14 downwardly against the Same pin |15. The lever |11 is provided with a depending arm |16 on which a stop arm |00 is mounted at |19, the free, i. e. rear, end of which is normally situated in the path of a pin |8| on the disk |6| carrying the clutch pawl |62. A spring |82 tends to maintain the stop arm |60 in this position by forcing it from below against a lateral projection |83 of the lever |11.

Shaft |12 which adjacent the left hand side member of the frame carries the arm |1| has keyed thereto in the right hand part of the machine an arm |84, see Fig. 4. Rotatably mounted on a stud |85 secured to this arm is an upwardly directed pawl |86 acted on by a spring |81. Said pawl normally engages the upper edge of a lateral projection |88 provided at one end of a bell crank lever |89 pivoted at |9| to a stationary portion |90 of the frame. At its other end said lever |89 carries a roller |92 bearing against the circumference of a cam |93 on the main shaft 80 under the action of a spring |94.

The pawl |86 is provided with an arm |95 depending below the stud |85. Extending through an aperture in this arm is a catch lever |96 pivoted at |91 to the rear end of link |56. The forward displacement of said link |56 above referredto asa result ofthe depression of either of the keys I2, I3 moves the catch lever |98 forwardly. The catch lever when thus moved forwardly brings the arm |95 with it, thereby swinging the pawl |86 out of engagement with the projectionY |88. The catch lever |96 is maintained in engagement with the lower edge of theV aperture in the arm |95 by the action of a spring |98. After having released the projection |88 the pawl |86 is allowed to descend by the action of its spring |81. Since the pawl |86 is mounted on the arm |84 it will take the latter with it, thereby turning the shaft |12 in clockwise direction as viewed from the right hand side of the machine (Fig. 4). The turning of 'shaft |12 swings the arm |1| backwardly (i. e. to the right in Fig. 1) so that the pin |10 thereon goes further into the slot |69 of fork |68, Fig. 3, thereby depressing the The releasing arm is now brought out of engagement with abutment |66 of the clutch dog |63, allowing the spring |64 to bring same into engagement with the clutch disc |60, thereby coupling together the toothed wheels I I8 and |26 and bringingthe shaft ||3 and thus also the main shaft into operative connection with the motor shaft to be driven thereby, as soon as the circuit of the motor is closed.

The opening, as well as the closing, of the circuit ofthe motor-is' also effected under the controlzof the starting keys'. To this end an interruptor for the motor circuit' is provided on the shaft |12 from which shaft the actuation of the releasing l1 arm |55 for the clutch pawl |63 is derived, as just described. Said interrupter consists of a pair of contact springs and 202 iastenedto said shaft |12 by means of a pair of insulating blocks 29S as shown in Figs. 11 and 12. Normally, the con tact springs extend in an approximately horizontal position, with spring 20| situated above spring 202.l Spring 202 carries a projecting arm 204 of insulating material which in the normal position of the machine abuts against a stop 205 in such a way as to hold spring 202 out of contact with spring 20|as shown in Fig. l1. As the shaft |12 on the depression of either of the starting keys |2 or I3 is turned in a clockwise direction in the` manner already described, the arm 204 is brought out of engagement with the stop 295, as shown in Fig. 12, thereby allowing the contact springs to meet and close the circuit.

The operations above described as resulting from depression ofeither of the keys I2 and I3 take place in the following order: Firstly, the clutch sleeve is actuated so as to effect coupling of the main shaft for the desired direction of rotation, that is to say, positive for multiplication and addition by depression of the starting "2:5

key I2 and negative for division and subtraction by depression of the starting key I3; secondly, the clutch IED-|93 is operated and, thirdly, the circuit of the motor is closed. If the clutch sleeve |25 has previously been set to the position desired, due to the fact that the starting key to be used has already been used in the starting of the machine next preceding, nothing will happen duringv the rst portion of the depression of the key, that is to say, while the abutment |3| or I 32 actuates the respective lever |33 or |34 and before it reaches the associated bell crank lever |5| or |52. If, for instance, the key I3r has been used in the starting of the machine next preceding, then the arm |42 will already be in the position. shown in Fig. 4 and, consequently, the descension of the lever |34 will have no effect.

In performing an addition or subtraction the `main shaft should only make one revolution after each depression of key I2 or I3; in performing a multiplication or division, on the contrary, the main shaft has to rotate continuously as long as the key I2 or I3 is held depressed. Thus either key has to control in the one case a single revolution and in the other case a continuous rotation. To permit this effect the shift arm l5 is provided.

The shift lever is loosely mounted on a transversely extending stud 206 fastened to the key board frame. It consists of a bell crank lever having a depending arm which extends freely through a slot in the lower wall 5 of the key board and a slot in an arm 201 extending across the frame which is situated below said wall 5 Y and engages below said arm a longitudinally eX- `vtudinally by means of a pin fastened to the base plate of the frame which engages a slot in the link.

The shift lever may be set into two positions:

,an upper position for addition and subtraction, designated by in Fig. 4, and a lower position for multiplication and division, d'e'zsignated .4 by X and respectively in Fig. 4. In'th'e-sa'id first mentioned position, which is that shown 4in Fig. 4, the stop zus is situatedeldw the catch lever |96. During the depression of either key l2 or key I3 and the resulting release by the catch lever |99 of the pawl |86 from its engage-v ment with projection |88 of lever |99 as already described so as to allow the spring |81 to turn the lever |84 and thus also the shaft |'|2 in clockwise direction to its starting position, the catch lever |96 remains resting on the stop 209. as shown in Fig. 13, which figure illustrates the end position after the movements just described have been completed. Due to the fact that the catch lever |96 is held in raised position by the stop 209 it is prevented from accompanying the arm |95 as the latter is forced downwards together withy the lever |84 by the action of the spring l'i. As a result, the engagement between the catch lever |96 and the lower edge of the slot in the arm |95 now ceases, and it is thus impossible for the catch lever |96 to prevent the pawl y|89 from being caught by the projection |88 and raised back again to its starting position, shown in Fig. 4, thus locking shaft |72 in its stop position as soon as the lever |89 is operated by cam |93 after a complete revolution of the main shaft. It is now impossible to again start the machine before the key |2 or |3 depressed has `been released, so as to allow the catch lever to return to the position shown in Fig. 4 under the inliuence of the spring |98.

When the shift lever |6 is in its lower (multiplication and division) position, the link is in its extreme rear position in which the stop member 209 is in a position behind the catch lever I 96 as shown by dotted lines at 209' in Fig. 4. On depression of `either key |`2 or key I3 and resulting forward displacement of the catch lever |96 the latter brings the arm with it just as before, but since it is not resting on the stop 299 now, it will maintain its engagement with the lower edge of the slot in the arm |95 and continue` to move downwards together with the arm |95. The final position now obtainedis that shown in' Fig. 14. In this position the pawl |86 is held swung out of the path described by the projection |88, as the lever |89 under the action of the cam |93 and the spring |94 is caused to oscillate on the stud |9|. Thus, in this case the projection |98 cannot engage the pawl |89l and raise same. The shaft |12 will thus remain in starting position, allowing the main shaft to rotate, until the key depressed be released. When this happens, the catch lever |96 will return to its normal position, allowing the projection |88 to catch the pawl y|89 and move same together with arm |84 and shaft |12 to stop position with resulting stopping of the machine due to the fact that the releasing arm |65 is brought into engagement with the abutment |55 of the clutch dog |63 and releases same.

On using the machine for an addition or subtraction the indexing mechanism has to be restored to its starting position at the right of the machine after each revolution of the main shaft. This restoring is also effected under the control of the shift lever I 6 by the aid of the following means. y

The toothed wheel I on the motorshaft from which the power for driving the main shaft is derived and which, to this end, is in constant mesh with the toothed wheel |'|8 on the rigid shaft'l I9, is also in constant mesh with a toothed Wheel 2|0, Fig. 3, loosely mounted on a stud 2H, Fig. 3, fastened to the left hand side member of the machine'fr'ame. A Said toothed wheel 'll 2 I0 is further in mesh with a toothed wheel 2 I3,

meng-,48o

looselymountedona shaft 2| 4v which is in'its 'turn rotatably mounted. Riveted to the toothed wheel 2 I 3 is aI clutch disc 2 5 concentric with the toothedwheel. Said clutch disc may be coupled rto the shaft 2|4 by means of a clutch dog A2|6 pivotallyfmounted on a drum 2|`1 keyed' to the'shaft` 2| 4. A spring- 2|8 acts-on theV clutch dog and-'tends to swingy the same into engagement with the notches of `the clutch disc 2115.

The clutch dog 2|6 carries on the opposite side of'its pivot 2|9an arm having an outwardly projecting tooth 220 sopositioned and arranged that it must engage an 'aperturev 22| `in the circumferential' wall ofthe clutch drum 2|1-in order to allow'the'dog to engage the clutch vdisc 2|5.

As long as thevtooth 22is prevented from entering the aperture 22|, the clutch dog Yis main- 'tained out of engagement withthe clutch disc, :so that no movement can betransferred from the motor-*to the shaft 2|4. The'operation of thetooth 220- is lcontrolled by meansof-two levers 222 and 223' both of which are loosely A-mounted on a stud 224 fastened to the lefthand side member ofr the machine frame outsideY the drum. Each Ylever -is provided with an inwardly 1 projecting` tooth 225 adapted to enter the aper- *ture 22| toysuchan extent as toY extend into'the path of the tooth 22!)` ofthe clutchdog.

The -lever 222 is controlled from the shift lever |6- of the keyboard. To this end 'thelever 2.22

is-connectedybymeans cfa depending link `2255,

la vbell crankA lever 221 mounted near the base plate of the machine frame, and a longitudinally extending link 228 to the arm 201 above referred to which-extends across the foremost, lower part of the key board frame. It has already been described'howthis arm 201 is connected to the shift lever I6. The left hand end of the arm 201 is pivf oted to the base plate at'230 andis connected at its middle point to the link 228 by means of the pivot 23|. `The apertureof the arm 201 adapted to receive the depending arm of the shift lever -is so designed as to cause the arm 201 to1 be operatedon shifting the lever I6. When `the shift lever isvinits-upper (that is to say, addition'or f subtraction) position, the` arm` 201 isv in'its for- -ward position, maintaining the bell crank lever 22'! in its forward position, as shown by dotted lines in Fig.f3. The link 226 is now held depressed and keeps `lever 222 lifted out of' engagement with theaperture 22|, as also shown by l dotted lines in Fig; With the shift lever in its lower position (that is to say, multiplication or division) vthe arm 201 is in its rear position. maintaining Ythe bell cranklever `221, vvthe link 225 andthe lever 2,22.in.their position shown, by full linesin Fig. 3. Inthis position the tooth 225 of lever 222 is inv engagement with the aperture 22| so as to prevent rotation of the-clutch drum, 2|1, thereby-also preventing the shaft, 2|4 from rotation.

The tooth 225 ciy lever 223 vis'normally inv engagement with the aperture 22| under the iniiuence of a spring23|. but vis released therefrom f :at the conclusion of each revolutionV of themain shaft. The means for effecting this-operation includes a pin 232 on the toothed Wheel |2| keyed to the shaft H3 and a cam lever 234 mounted at 233. rThe cam 235 of said lever is actuatedby the pin 232 once at each revolution ofshaft H3. The, free end of the cam -lever is` shaped as a #forkv 236 engaged by apinf 231 carried by'A the "lever 223. .AsA the caml 235 is raised` by `the pin 232," thel pin 231 will be raised sufficiently tore- Vin Fig. 19.

the following means.

lution of the main shaft, as just described. Now,

the clutch dog vis allowed to enter the aperture 22| and couple the shaft 2|4 to the clutch disk 2,|5 thereby causing the shaft 2|4 to be rotated one revolution ateach revolution of the main shaft, whereupon the tooth 225 ofthe ylever 223 by again engaging'the aperture 22| stops the clutch drum 2 |1 and its shaft 2 I4. The rotation ofthe shaft 2| 4 takesV place immediately after the' rotation of themain shaft or, rather, the 'shaft H3.

The rotation of shaft 2|4 is utilized inv effecting the restoration of the indexing register by Attached to the shaft 2|4 is a-camdisc 240, Fig. 18,A engaged by a roller 24| carried at theuppervend of a lever A242 mounted to rock on apivot intermediate between its ends. The lov-fer end of the lever 242 is shaped as a toothed segment 243 in constant mesh with a `toothed wheel 244 mounted on a. stud 245 fastened tothe right hand side member of the machine frame. Alsomounted on this stud'is a rope drum 245, rigidly attached tothe toothed wheel 244;- see Fig; 19.

Attached to the rope drum is a rope 241 extending along -the'vright hand side member 3 of the machine frame to or around a loose pulley 24S-mounted adjacent the indexing mechanism, thence across the machine through an eye 249 adjacent the rightv hand' end of the frame 23 of the -indexingmechanism and along said mecha t nism to a ltension spring 250 to the right hand end of which the rope is attached. Adjacent said spring the rope carries a collar 25|v acting as a catch dog for the eye 249. Normally the rope is held in the-position show In this position the catch dog 25| is in its left-hand position, the eye 249 being immediately adjacent thereto when the indexing mechanism is in its extreme left hand position,

Each time the shaft 2| 4 in performing an addition rorsubtraction rotates one revolution inthe way above described, the upper end ofi'therarm 242 is swung graduallyY outwards by the action vof the cam 240fwhile rotating-the toothed wheel 244k so as to wind therrope'uponthe drum. The

catch dog 25| now moves the-eyefwith it, restorving the-indexingmechanism to its starting position` at the right of the machine, irrespective of the positionof the indexing mechanism. As soon as'the action of the cam disc ceases at the end of the revolution, the spring 250 retracts the rope. thereby returningthe drum and the arm 242 to theirv startingV positions shown inFigs. 18 and 19.

Simultaneously with the returning ofthe' indexing mechanism tov its starting position the racks-ofv the indexing mechanism arepositlvely returned to normal by means of a bell crank vlever 360, Fig. 21'. This lever is pivotally mounted l at 36| to the right hand side'member 3 of the Vmachine frame; An upstanding arm ofthe lever extends into the path of the indexing mechanism, so that it willbe forced-towards the-wall `its normal position. and operates the bell crank lever 360 the lower arm thereof will be raised, thereby restoring all of the racks 30 depressed.

While in operation for controlling the automatic restoration of the indexing mechanism the shaft 214 also controls the interrupter for the motor circuit. This is effected by means of the stop 205k cooperating with the lower contact spring 202, Fig. 20, as already described. The stop 205 consists of a vertically movable slide guided, in part, by a stationary pin 260 engaging a slot 261 in the lower portion of the slide and, in part, by the shaft 214 extending through a, slot at the upper end of the slide, see Fig. 20. A pin 254 secured to the slide 205 below the slot 262 is perpetuallylheld' in contact with a cam disc 263 on the lshaft 214 bythe action of a spring 265. As

long as shaft 214 stands still, the interrupter is 222 being in its operative position, the interrupter -is thus controlled merely from shaft 112. On rotation of shaft 112 in clockwise direction by depression of either of the starting keys 12, I3, the

`interruptor is thus closed, to be again opened whenthe shaft 112 upon the completion of a revolution of the main shaft 80 is returned to its normal position.

In addition or subtraction, the tooth 225 of lever 222 is constantly out of engagement with the aperture 221 of the clutch drum 211 and the arm 234 will be raised by the pin 232 immediately prior to the main shaft reaching its normal position. The clutch 215-216 is now operated.

At this moment, immediately after the opening of its circuit, the motor has still a sufficient speed to turn the shaft 214 to such an extent as to cause the top of the cam 263 to slide off the pin 264, allowing the spring 265 to raisethe stop member 205 and cause it to bring the interrupter spring 202 into contact with spring 201, thereby again closing the circuit. The shaft 214, but not themain shaft, is now rotated one revolution until, at the completion of this revolution, the cam` 263l depresses the stop member 205 to such an extent as to move spring 202 out of contact with spring 201, thereby again opening the circuit.

In multiplication or division, in which case the indexingmechanism remains in calculating position as long as the respective starting -keyis held-depressed, a more smooth and reliable operation of the counting spindles will be obtained,

if the spindles remain in their displaced positions .as long as the indexing mechanism remains in the counting position. To obtain this effect the folfvlowing means are provided.

Looselyv mounted on the laforesaid bearing post VIA190.by means of two pins; viz. one upper 21| and 3onelovver 212 is a platel 210. The pins engage n arc-shaped slots 4213 and 214, respectively, in a side member of the bearing post. A tension spring 215 acts to move the upper end of plate 210 rearwardly. A link 216 connects a pin 211 on the plate 210 to the pin 191 on the starting link 156. By the combined action of the spring 215 and the starting link the pivot pins 211 and 212 of plate 210 are normally kept in contact with the rear ends of the respective guide slots 213 and 214. Provided near the bottom of the bearing post |90 is a pawl 218 mounted on the pivot 219 Which is adapted to engage the lower end of plate 210. The operation of said pawl is controlled by the shift link 208. The upwardly projecting end (l. e. the stop 209)` of this link is formed at about half of its height with a shoulder on which the lower edge of the pawl rests. When the stop 209 is in its fore position, that is to say, when the shift lever 16-is set for addition or subtraction, as lshown in Fig. 4, said shoulder is situated below a forwardly extending projection 280 of pawl 210 which is thereby held depressed out of the path of the lower end of plate 210. As any of the starting keys 12 or 13 is depressed and the starting link 156 is pulled forwardly, it will move link 216 with it. The pivot pin 211 when thus moving forwardly (to the left in Fig. 4) causes the plate 210 to swing about its upper pivot'211 which is held stationary in its rear position by the tension of spring 215 While the lower pivot pin 212 moves forwardly (to the left in the drawing) from the rear end to the fore end of slot On shifting the lever 16 to its lower position (for multiplication or division) the link 208 is displaced rearwardly, as already described, until the stop member 209 reaches the position indicated at 209. During this movement the shoulder of member 209 slides along the under side of the pawl 218 and raises it so that its rear end Acomes into the path of the lower end of plate 210, as shown in Fig. 15. The pin 212 is thus locked in its position at the rear'end of slot 214. If now the starting key 12 or 13 be depressed, the link 216 is pulled forwardly, causing plate 210 to swing-about its lower pin 212 thus locked. The upper end of plate 210 is now tilted forwardly (to the left in the drawing) against the action of spring 215, the pin 211 sliding in the slot 213 from the rear to the fore end thereof. Said two extreme positions of pin 211 are indicated in Fig. l. at 211V and 211', respectively. In the said last mentioned position the pin 211 is within reach of an arm 281 of the pawl 89 mounted on the slide 84 which engages the pin 82 of the rear arm 81 of the bridge 18. When the pin 211 in addition and subtraction is in its extreme rear position, as indicated at 21| in Fig. 1, it is out of reach of the arm 28|. The arm 281 may thus movefreely up and down with the slide while allowing the pawl 89 to keep the pin 82 at the bottom of the slot 83, as in Fig. 1. The pin 82 thus moving with the slide causes the bridge to rock up and down once for each revolution of the main shaft, thereby dropping the counting spindles as in Fig. 1 and again raising them once each revolution, as in Fig. 1a.

In multiplication and division, the pin 21 while moving in the way described to its extreme fore position, as indicated in dotted lines at 211' in Fig. 1, depresses the arm 231 causing the cam shaped lower end of the pawl 89 to release the v pin 82, so thatit cannot be operated by the reciprocating slide. Thus, the bridge 10 moves to its depressedvgstate. as shown in Fig. 1, in its turn 17 allowing the counting spindles to drop to their lower displaced positions.

As hereinbeiore stated the totalizer and the quotient register of the machine are mounted in a carriage reciprccable across the machine frame. In the drawing (Fig. 1) said carriage II is shown in section, the totalizer being only indicated by a circle B9 representing a totalizer wheel or rather an associated toothed wheel adapted to engage any of the toothed wheels 68 of the counting spindles as the beam 53 is raised. The quotient register serving to register the number of revolutions of the main shaft is not shown in the drawing. It is mounted at the right of the carriage and controlled by the uppermost proportion rack IIJt corresponding to the digit l. To this end the right hand end of said proportion rack is linked to a control bar 29|) (Fig. 16) extending through an aperture 29| in the right hand side member 3 of the frame. tion between the rack 33 and the control bar consists of a universal joint 292 allowing the bar to swing both up and down and to the sides within the range determined by the aperture 29|. The control bar 299 consists of a plate lying in a horizontal o1' nearly horizontal plane which is formed with a slot 233 the fore and rear parallel edges ci which are each provided with a row of teeth 293 and 295, respectively, which on the swinging of the plate are alternately brought into mesh with a pinion 293 on anupstanding spindle 2.9i. The aperture 29| in the frame side member 3 has on its lower edge a tooth 298 and the plate 299 has a depending ringer 299 (Fig. 17) which by horizontal and vertical oscillation of the plate 293 may be brought to a position in front of or behind the tooth 298 according as it is desired to keep the fore or rear row of teeth 23:3 or 295 in mesh with the pinion 296. The shaft 291 is only rotatably but not slidably mounted in the frame of the machine and engages at its upper end with a sleeve Shaped member 333 in a way similar to that in which the lower members 3| of the counting spindles engage the sleeves t2. The sleeve 300 carries at its upper end a mitre Wheel 33| in constant mesh with a mitre wheel 302 loosely mounted on a stud V333 carried by a post on the beam 63., said mitre wheel being rigidly connected to a spur wheel 304 adapted to mesh with a toothed wheel f of the quotient register subsequent to the raising of the beam S3 in the same way as already described in connection with the description of the counting spindles. Since the movement of the spindle 29? is exclusively derived from the ,f

uppermost proportion rack |39, the toothed wheel oi the quotient register is only rotated one tooth upon each revolution oi the main shaft.

In connection with the totalizer tens transfer mechanisms of various kinds may be provided.

The stepping' of the totalizer carriage under the control of the tabulator keys I4, I5 is effected by means of the following mechanism.

The supporting rods 3Ill and 3II of keys I4, I5 operate each on the horizontal arm of an individual T-shaped rocking lever 3I2, Fig. 2, the depending arm ci which is connected by a horizontal link 3 i 3 and a bell. crank lever 3 I5 mounted on a vertical stud 3 lil to the lower end of a vertical lever 3|6, Fig. 8. Said lever is mounted at about its middle point on a stud 3H. The upper end oi the lever 3|@ is fork-shaped and engaged by a pin 353 fastened to the right hand end oi a slide 3W mounted to the rear surface of the cross bar 8. The slide 3 i 3 comprises a, Plate having two..

The connec- 18 longitudinally extending slots 320 by means of which the plate slides on a pair of guide pins 32E fastened to the cross bar 8.

The stud 3|? on which the vertical lever 3I3 is mounted is carried by a bracket 322 fastened to the side wall 3 of the machine frame. Fastened to the saine bracket on the same level as the stud 3| 'I but nearer to the side wall 3 is another stud 323 carrying two restoring dogs 324 and 325 for the lever 3 I 6. Said restoring dogs bear against the inwardly facing edge of the lever 3I6, viz. dog 326i engaging the lever above and dog 329 below its pivot 3I'I. Each dog is carriedby a lever having an arm 32%:` or 32'! facing the wall 3 and bearing thereagainst in the normal (i. e. vertical) position of the lever 3I6. The lever of dog 4324 carries, in addition, below the stud 323 a downwardly and inwardly inclined arm 328, the lever of dog 325 carrying an upwardly and inwardly inclined arm 329 above the stud 323. Inserted between the ends of said arms is a tension spring 330.

The slide 3| 9 carries two pawls 33| and 332, the former adapted for moving the totalizer carriage to the right and the latter for moving the carriage to the left. Said pawls act on a common ratchet gear 334 mounted at 333 to the middle of the cross beam 8 which is provided with a number, say six, ratchet pins 335 parallel to the pivot pin 333 of the gear. The pawls are oppositely arranged with respect to the ratchet pins so as to rotate the gear 334 in opposite directions. The ratchet gear is also formed with teeth on its circumference so as to form a toothed wheel in mesh with a toothed wheel 336 for driving a transmission element of the carriage not shown.

As long as the tabulating keys I4, I5 are not operated the link 3I3 is in an intermediate position in which position the longitudinally extending arm of bell crank lever 3I5 extends parallel to the side wall 3 of the machine frame, as shown in Fig. 2, and the link 3|6 is in its vertical position, as shown in Fig. 8. The slide 3I9 now is in an intermediate position in which the pawls 33| and 332 bear with their ends against two adjacent pins 335 of gear 334. On depression oi key I4 the lever 3| 2 is rocked in a counterclockwise direction, as viewed from the right hand side of the machine, the link 3I3 is displaced rearwardly and the longitudinally extending arm of bell crank lever 3I5 is moved to the left, that is to say, away from the side wall 3. The movement of lever 3I5 turns the lever 3 I 3 in a clockwise direction in Fig. 8, thereby displacing slide 3I9 to the right. The pawl 33E carries the pin 335 in contact therewith with it turning the ratchet geer 334 in a counter clockwise direction in Fig. 8 to an extent determined by the slots 32D, that is to say, in the example shown, 60 degrees. The pawl 332 being at the same time moved to the right does not prevent the rotation of the gear. As the key is released, the vertical lever 3|3 is restored to its intermediate position by the spring 330 and restores in its turn, on the one hand the link 3I3 and the key I 4 and on the other hand the slide 3|9 to their normal positions. On the return of the slide the pawl 33| is slid along the under side of the succeeding pin 335 and is thereby swung downwards. This is due to the fact that in the normal position of the pawls depending arms 34! and 342, respectively, of the pawls abut against vertical shoulders of the slide which prevent rais- 75 ing of the pawls beyond their normal position 19 but allow downward movement of the pawls, as will clearly appear from Fig. 8.

On depression of the key I the various elements under consideration will be operated in the reversed order to that above described. In this case the gear 334 is turned 60 degrees in a clockwise direction upon each operation.

As I have hereinbefore described the operations ofthe various main parts of the machine it is deemed unnecessary to describe the operation of the-machine as a whole with the exception of some explanations.

As to the transfer of the items to the totalizer the following is to be noted.

The direction of rotation of the main shaft 80 determines the direction of rotation of the counting spindles at the time when the numeral wheels of the totalizer are driven. This will appear from Fig. 22, the cam slot |08 showing that a rotation of the main shaft 80 in the direction of the arrow S will move the arm |06 in the direction S', moving the proportion racks tothe position shown in Fig. 6. This operation has taken place during the slope A of the curved slot. The proportion racksV remain in this position under the control of the section B of the slot |08. During this standstill the bridge 'I8 descends in the way already described and the guide rods 13 with the associated lower members 6| of the counting spindles are displaced to the positions determined by the indexing mechanism or selector. If, for instance, the key representing the digit 8 has been depressed, then one of the racks has been moved down till it strikes to stopping end 22 (Fig. 1) and the spindle is displaced accordingly, While the remaining spindles descend into engagement with the stationary rack |0I corresponding to the digit 0 which cannot turn the spindles. In the meantime the beam 63 together with the sleeves 92 and the toothed wheels 68 are raised to bring the latter into mesh with the numeral wheels 69 on the totalizer carriage 'll owing to the fact that the cam 99 on the main shaft has rotated the forked arms 92 in a clockwise direction and raised the slides 90. During this operation the bridge 95 interconnecting the arms 94 formed integrally With the arms 92 engages the braking pawls 96, causing them to release the totalizer wheels 69 so that they may be easily rotated by the counting spindles, which will thus be subjected to a very slight load only. rI'his in its turn provides Very easy running of the machine. During that portion of the rotation of the drum |09 in which the section C of the cam slot |08 is in operation, the arm |06 is shifted to its opposite extreme position, mcvingthe proportioning racks to the position shown in Fg. 7, the amount of movement of each individual rack depending on its position with relation to the other racks. Thus, the eighth rack as reckoned from above is moved eight steps and the counting spindle controlled thereby is turned through a corresponding angle, in its turn imparting over the respective intermediate wheel 68 a corresponding rotation to a numeral wheel of the totalizer. As thereafter the straight section D of the cam slot |08 comes into operation the proportion racks are held stationary. In the meantime the beam 63 descends, bringing the intermediate wheels 68 out of mesh with the numeral wheels 09, the lower member 6| of the counting spindles being simultaneously raised to their normal position. Then the cam slot |08 returns to its normal position, restoring the proportion racks |00 to the position shown in Fig. 5. Let it now be assumed that the main shaft rotates in the reverse direction, that is to say, as indicated by the arrow `T in Fig. 22, then the arm |06 would rst move to the position shown in Fig. 7, before the spindles and the associated intermediate wheels reached their operative or counting position. It is thus seen that also a reversal of the direction of rotation of the spindles would be opposite to that just stated.

What I claim is:

1. In a machine of the class described, the com- -bination of an indexing mechanism movable in the transverse direction of the machine, a keyboard including ten numeral keys for setting items up in the indexing mechanism, a carriage movable in the transverse direction of the machine, totalizing wheels and associated gear wheels thereon, a row of approximately vertical counting spindles extending in the transverse direction of the machine below the path of said carriage and behind the indexing mechanism, a pile of racks arranged behind said row of counting spindles including a stationary rack and a set of slidable proportion racks thereon, extending in a direction at right angles to the spindles, gear wheels on the spindles to cooperate with said proportion racks, means to displace the spindles axially to bring the gears thereof into mesh with the desired racks, means carried by the indexing mechanism to predetermine said displacement of the spindles in accordance with the setting of the indexing mechanism, a main shaft, means operable by the main shaft to bring the spindles thus displaced into operative connection with the gear wheels of the totalizer carriage and a proportion lever adapted to oscillate under the control of the main shaft to displace the proportion racks.

2. A machine according to claim 1, wherein said indexing mechanism comprises a carriage shiftable transversely of the machine, an escapement mechanism for controlling stepwise movement of said carriage in response to depression of said keys, a group of indicating numeral wheels mounted in said carriage, Springurged racks slidably mounted in said carriage in engagement with said numeral wheels and adjustable axially of said counting spindles by said keys in sequence, the means for predetermining the displacement of the counting spindles comprising shoulders formed on the edges of the racks facing the counting spindles, said shoulders serving as stops for said spindles, said means for axially displacing said spindles comprising springs.

GUSTAF VILHELM LILJESTRM.

REFERENCES CITED The following references are of record in the file of this patent:

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